Assertion :Though different ions are present in same group still they have different $K_{s p}$ . Reason: Different ions present in same group are tested by their specific colours.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Though different ions are present in same group still they have different $k s p$ . This is because there are various factors which effect the solubility product like, temperature, pressure, polarity and molecular size etc.
Also, since different ions have different molecular sizes . Therefore, they have different $k s p$ .
Different ions present in same group are tested by their specific colors. Different ions of same group are treated with various reagents to test for reactions characteristic of certain ions. Which may cause color change, precipitation and other visible changes.

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Assertion :Though different ions are present in same group still they have different Ksp. Reason: Different ions present in same group are tested by their specific colours.

Assertion :Though different ions are present in same group still they have different $K_{s p}$ . Reason: Different ions present in same group are tested by their specific colours.